2.8 Light Bleeding in EEVEE?
EEVEE is not good at calculating shadow light path, since it's not ray tracing.

There is a contact shadow option in your light source setting:



It uses ray tracing to "fix" those bleeding area:



In game practice, light will not likely put outside the wall, and should use some light stop method to make it stay in specified area. Might use Cycles for those great lighting result.